“Error 404 Not Found” in Magento Admin Login Page

I got “Error: 404 Not Found” when  transfered my magento installation from one local machine server to another. Now, I cannot login to admin panel and I got “Error: 404 Not Found”

The reason for this error is that store_id and website_id for admin should be set to 0 (zero). But, when you import database to new server, somehow these values are not set to 0.
Open PhpMyAdmin and run the following query in your database:-

SET FOREIGN_KEY_CHECKS=0;
UPDATE `core_store` SET store_id = 0 WHERE code='admin';
UPDATE `core_store_group` SET group_id = 0 WHERE name='Default';
UPDATE `core_website` SET website_id = 0 WHERE code='admin';
UPDATE `customer_group` SET customer_group_id = 0 WHERE customer_group_code='NOT LOGGED IN';
SET FOREIGN_KEY_CHECKS=1;

Source : http://stackoverflow.com/questions/5178066/error-404-not-found-in-magento-admin-login-page